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Pages in category "Volcanic plugs of California" The following 14 pages are in this category, out of 14 total. This list may not reflect recent changes. B.
Volcanic plugs of California (1 C, 14 P) Pages in category "Volcanoes of California" The following 66 pages are in this category, out of 66 total.
The 581-foot (177 m) [1] Morro Rock is one of 13 volcanic plugs (remnant necks of extinct volcanoes), lava domes, and sheetlike intrusions between Morro Bay on the north and Islay Hill on the south, all in San Luis Obispo County. [8] It is composed mostly of dacite, an igneous, volcanic rock.
The peaks were created more than 20 million years ago during the Miocene Epoch of the Neogene Period, as volcanic plugs of magma which welled up and solidified inside softer rock which has since eroded away. [citation needed] Every plug, with the exception of just two, formed in a nearly straight line. Two of the plugs are in Morro Bay State Park.
Volcanic plugs of California (1 C, 14 P) Pages in category "Rock formations of California" ... Mono Lake Tufa State Natural Reserve; V.
Volcanic plugs of California (1 C, 14 P) Pages in category "Volcanic plugs of the United States" ... Beacon Rock State Park; Bennett Peak (New Mexico) ...
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A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile -charged magma is trapped beneath it, and this can sometimes lead to an explosive eruption.